You notice that the performance of your production 24x7 Oracle 12c
Database has significantly degraded. Sometimes, you are not able to connect
To the database instance because it hangs.
How can you detect the cause of the degraded performance?
A.正确答案Aby performing emergency monitoring using Real-Time Automatic Database
Diagnostic Monitor (ADDM) to fetch data directly from SGA for analysis
B.by running ADDM to fetch information from the latest Automatic Workload
Repository (AWR) snapshots
C.by using Active Session History (ASH) data and performing hang analysis
D.by running ADDM in diagnostic mode
